I'm getting activations that I shouldn't when using the 'this' keyword on @propertyReactive objects. Here's a simplified example: package bug dialect "mvel" declare Monkey @propertyReactive name:String emotion:String hot : boolean end declare Barrel @propertyReactive topMonkey:Monkey end rule "Initial Facts" when then monkey =new Monkey("Thomas","sad", false) insert (monkey) insert (new Barrel(monkey)) insert (new MonkeySuit(monkey, false)) end //This will loop forever even it shouldn't (it's not modifying any of the properties in the constraint) //To fix, reinstate the watch annotation below to correct the watched property list rule "When a monkey is on top and his name is Thomas he should be made happy" when Barrel($monkey: topMonkey) Monkey(this==$monkey, name=="Thomas" ) //@watch(!*,name) then System.out.println($monkey.getName() + " should be happy!") modify ($monkey) { setEmotion("happy") } end It's only when using the "this" keyword. Apparently it is including the "this" in the inferred property watch list since when I clear the watch list and rebuild it correctly using the @watch annotation, all works fine. Has the "this" keyword been deprecated? I can't see any sign that it has so this appears to be a bug. For now I'm getting it to work by matching my facts on unique Ids instead of "this" but "this" is handier when an Id property is unavailable. -- View this message in context: http://drools.46999.n3.nabble.com/PropertyReactive-optimizations-broken-w... Sent from the Drools: User forum mailing list archive at Nabble.com.